Question

Cigarette smoking causes emphysema .give reason

Answer 1

Emphysema is a form of chronic (long-term) lung disease. This and chronic bronchitis are the two main types of chronic obstructive pulmonary disease (COPD), the third-leading cause of death in the United States.

These conditions are called “obstructive” because it’s as though something is blocking the smooth flow of air in and out of the lungs.

Doctors estimate that more than 24 million people in the United States have emphysema or another form of COPD. Many of them don't know it.

Answer 2

hey mate here is the answer....

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Emphysema:
The the word emphysema means 'full of air' or 'inflammation'.
It is a chronic disorder.
Cause:
The major cause is excessive cigarette smoking.
Others may include inhalation of smoke or toxic substances over a period of time. Symptoms:
The walls of alveoli are damage due to excessive smoking, lose of elasticity of walls of bronchioles and alveoli.
Due to this the surface area for exchange of gases is reduced.
Alveolar sac remain filled with air even after expiration.
The lungs remain in plated as exhalation becomes difficult.
This disease may be prevented by avoiding cigarette smoking.
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thanks...

nice to help you